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Articles 121 - 150 of 186
Full-Text Articles in Microbiology
Assessing Listeria Risk During Different Stages Of Ice Cream Manufacturing And Storage, Neha Singh
Assessing Listeria Risk During Different Stages Of Ice Cream Manufacturing And Storage, Neha Singh
Electronic Theses and Dissertations
Listeriosis is a life-threatening infection caused by foods contaminated with Listeria monocytogenes. Some of the major ice cream recalls in recent years reaffirm the ability of this food-borne pathogen to survive in diverse dairy processing environments and cause cross contamination. Inspection reports revealed certain lapses in implementing adequate hygienic practices for Listeria persistence in the processing environment, leading to cross contamination of ice cream. The higher levels of cross contamination of raw ice cream mix might result in random heat-injured cells when exposed to minimum heat treatment (69°C for 30 min). Evidence about the presence of injured cells in ice …
Isolation And Identification Of Potential Bioinoculants Based On Phosphate Solubilizing And Plant Growth Promoting Benefits, Rachel Raths
Isolation And Identification Of Potential Bioinoculants Based On Phosphate Solubilizing And Plant Growth Promoting Benefits, Rachel Raths
Electronic Theses and Dissertations
Conservative models have shown that as populations rise, food production needs to double by 2050. Population increase and the green revolution have caused fertilizer inputs to increase since the 1960’s, increasing environmental issues and production costs. These intensive practices have led to degraded arable land and there has been an increase in urbanization meaning we need to make best use of the farming land that is available and ensure it is sustainable for future food production. Due to this, there has been a higher demand for research on more environmentally and economically friendly approaches to food production. Plant growth promoting …
Shrimp Production Environment And The Gut Microbiome: Effects Of Aquaculture Practices And Selective Breeding On The Gut Microbiome Of Pacific Whiteleg Shrimp, Litopenaeus Vannamei, Angela Landsman
Electronic Theses and Dissertations
Knowledge of the functional role of the gut microbiome in animal health and nutrition may provide solutions to shrimp aquaculture challenges, such as improving disease resistance and optimizing growth particularly with low cost feeds. Successful manipulation of bacteria found in the gut requires a deeper understanding of shrimp microbial communities and how their compositional structure is influenced by environmental conditions, and inherent host factors such as genetics. The initial research investigated the intestinal bacterial communities of the Pacific whiteleg shrimp (Litopenaeus vannamei) reared in pond systems compared to indoor aquaculture facilities as an exploration of the effects of aquaculture practices …
Comparing Gut Microbiome And Virome In The Breast Milk- And Formula-Fed Late Preterm Infants, Zyi Wang
Comparing Gut Microbiome And Virome In The Breast Milk- And Formula-Fed Late Preterm Infants, Zyi Wang
Electronic Theses and Dissertations
The neonatal intestinal microbiome consists of all microorganisms in the gut. Although the microbiome is critical to human health and disease, its colonization remains incompletely understood, particularly in the preterm infant. We aimed to characterize the intestinal bacteria microbiome and virome in moderate-to-late preterm infants. We hypothesized that the bacteria microbiome and virome differs between breast milk and formula-fed infants. We collected stool samples from twenty infants born between 32 0/7 and 36 6/7 weeks gestation. Samples were collected after infants reached full volume enteral feedings. Ten infants were breast milk fed and ten received infant formula. DNA and RNA …
The Effect Of Proteolytic Queues On Antibiotic Tolerance And Persistence Cells Population In Escherichia Coli, Alawiah Abualrahi
The Effect Of Proteolytic Queues On Antibiotic Tolerance And Persistence Cells Population In Escherichia Coli, Alawiah Abualrahi
Electronic Theses and Dissertations
A major contributing factor to the abundance of antibiotic-resistant microorganisms and failed antibiotic treatment is survival due to antibiotic tolerance and persistence. Antibiotic tolerance is a widespread phenomenon that enables cells to survive treatment without carrying a resistance gene. This phenomenon renders antibiotic treatments less effective and facilitates antibiotic resistance. We are particularly interested in proteases, responsible for degradation of proteins, because of their known relationship to tolerance and persistence. Here, we examine the effects of proteases and antibiotic survival using queueing theory, in which one type of customer competes for processing by servers, that has traditionally been applied to …
Development And Evaluation Of Vaccine Candidates For Senecavirus A, Bishwas Sharma
Development And Evaluation Of Vaccine Candidates For Senecavirus A, Bishwas Sharma
Electronic Theses and Dissertations
Senecavirus A (SVA) has been associated with several outbreaks of vesicular disease (VD) since 2014 in major swine-producing countries around the world. The virus causes VD that is clinically indistinguishable from foot-and-mouth disease (FMD) in pigs. Currently there are no commercial vaccines available for SVA. Here, we developed a live attenuated SVA strain by mutating a wild type SVA strain SD15-26 (wt SVA). The live attenuated virus, rSVA mSacII, replicated less efficiently in cell cultures in vitro and expressed lower amounts of VP1 and VP2 capsid proteins than wt SVA. Most importantly, the rSVA mSacII virus failed to induce clinical …
Bovine Cellular And Innate Immune Response To Hemostatic Polysaccharides, Brian Kobylkevich
Bovine Cellular And Innate Immune Response To Hemostatic Polysaccharides, Brian Kobylkevich
Electronic Theses and Dissertations
Chronic wounds are longstanding dermal wounds that do not heal in a normal amount of time and can commonly last for over a year. These wounds plague humans and farm animals alike. Wounds are characterized by chronic inflammation and are often painful, difficult to heal, have a high recurrence rate, and are potentially debilitating. Long term wounds that do not fully heal are distressing for both humans and animals, but understandably more resources have been directed towards humans. Some treatment options for humans may be suitable for adaptation into the field of animal care. Chronic lesions such as bovine digital …
Hydrodynamic Cavitation As In-Line Process To Control Common Dairy Sporeformers, Pratibha Chaudhary
Hydrodynamic Cavitation As In-Line Process To Control Common Dairy Sporeformers, Pratibha Chaudhary
Electronic Theses and Dissertations
Sporeforming bacteria and their endospores have the ability to survive thermal treatments and proliferate in the milk and dairy products to cause spoilages. We applied the effect of hydrodynamic cavitation in controlling these bacteria and their spores at pilot scale level. Our aim was to investigate a technology that would improve the microbial quality of milk and dairy products, and is capable of being scaled up to be adapted at industrial level. Cavitation damages the cell walls of the bacteria and their endospores (releasing dipicolinic acid, responsible for endospore resistance to extreme conditions), thereby making them susceptible to thermal treatments …
Interactions Of Arbuscular Mychorrhizal Fungi And Bacterial Endophytes On Disease Resistance Of Common Root Pathogens In Wheat, Janice L. Eibensteiner
Interactions Of Arbuscular Mychorrhizal Fungi And Bacterial Endophytes On Disease Resistance Of Common Root Pathogens In Wheat, Janice L. Eibensteiner
Electronic Theses and Dissertations
Arbuscular mycorrhiza, a symbiosis between plants and fungi, help plants to capture nutrients such as phosphorus (P), nitrogen (N) and other micronutrients from the aggre in exchange for up to 20% of the fixed carbon (C) from the plant. In addition, arbuscular mycorrhizal (AM) fungi can improve the resistance against abiotic (drought, salinity), and also biotic (pathogen) stresses. Bacterial endophytes promote plant growth and yield by fixing N2 from the atmosphere, assimilating N and transfer it to the plant. Bacterial endophytes can also solubilize phosphate and stimulate plant defense responses, suppressing pathogens. The host plant provides sucrose and a favorable …
Development Of Computational Techniques For Identification Of Regulatory Dna Motif, Cankun Wang
Development Of Computational Techniques For Identification Of Regulatory Dna Motif, Cankun Wang
Electronic Theses and Dissertations
Identifying precise transcription factor binding sites (TFBS) or regulatory DNA motif (motif) plays a fundamental role in researching transcriptional regulatory mechanism in cells and helping construct regulatory networks for biological investigation. Chromatin immunoprecipitation combined with sequencing (ChIP-seq) and lambda exonuclease digestion followed by high-throughput sequencing (ChIP-exo) enables researchers to identify TFBS on a genome-scale with improved resolution. Several algorithms have been developed to perform motif identification, employing widely different methods and often giving divergent results. In addition, these existing methods still suffer from prediction accuracy. Thesis focuses on the development of improved regulatory DNA motif identification techniques. We designed an …
Increasing Accumulation Of Glyceollins In Soybeans Via Optimization Of The Fungal Incubation Process, Stephanie Wootton
Increasing Accumulation Of Glyceollins In Soybeans Via Optimization Of The Fungal Incubation Process, Stephanie Wootton
Electronic Theses and Dissertations
Continual use of antibiotics in the feed of food animals was viewed a solution to the problem of disease outbreaks in livestock produced in confinement operations. This practice also improved animal performance, likely due to the reduction in sub-clinical infections. Unfortunately, this practice led to a new problem, the development of antibiotic resistant microbes. This increase in antibiotic resistance reduced the direct benefits of antibiotics in animal production. Moreover, as antibiotic resistance spread from animal to human pathogens, this practice created a major public health concern. This led the FDA to enact the Veterinary Feed Directive in 2017 that greatly …
Improvement Of Dried Distillers’ Grains With Solubles Utilizing Pretreatments And Fungal Fermentation, Burgandy Zschetzsche
Improvement Of Dried Distillers’ Grains With Solubles Utilizing Pretreatments And Fungal Fermentation, Burgandy Zschetzsche
Electronic Theses and Dissertations
Limited inclusion of distillers’ grains in animal feed is primarily due to low protein and high fiber content. Other elements, such as phytate phosphorus levels in DDGS are still an issue for monogastric animals such as swine, poultry, and fish. Furthermore, unabsorbed phytic acid in manure poses a high risk for environmental pollution, because bacteria can hydrolyze phytic acid into free phosphorus that can result in algal blooms and eutrophication of surface or ground water. The objective of this thesis was to improve the nutritional value of corn dried distillers’ grains with solubles (DDGS). This was done utilizing submerged fungal …
Comparative Optic Nerve Head Physiology: Glaucoma Induced Retinal Ganglion Cell Apoptosis By Disruption Of The Translaminar Pressure Gradient And Reduced Neurotrophic Signaling, Cassidy Christopherson
Comparative Optic Nerve Head Physiology: Glaucoma Induced Retinal Ganglion Cell Apoptosis By Disruption Of The Translaminar Pressure Gradient And Reduced Neurotrophic Signaling, Cassidy Christopherson
Biology and Microbiology Graduate Students Plan B Research Projects
Glaucoma is the leading cause of irreversible blindness, and the second leading vision loss neurodegenerative disease affecting millions worldwide. Glaucoma is characterized as a group of eye disorders which are initially asymptomatic but may progress to significant optic nerve head damage and vision loss with time. Early stages of glaucoma often go undetected, leading to irreversible damage to the optic nerve head prior to patients seeking medical care. Glaucoma leads to vision loss via death of retinal ganglion cells. Retinal ganglion cell apoptosis is thought to begin due to interference with the normal transmission of neurotrophic signals that arrive by …
Irritable Bowel Syndrome With Constipation (Ibs-C) Treatment Efficacy And The Emerging Importance Of Serotonin, Meghan Schenk
Irritable Bowel Syndrome With Constipation (Ibs-C) Treatment Efficacy And The Emerging Importance Of Serotonin, Meghan Schenk
Biology and Microbiology Graduate Students Plan B Research Projects
Irritable bowel syndrome with constipation (IBS-C) affects a large proportion of the population. It decreases quality of life for the patient both physically and mentally. Patients report higher levels of mental health issues and other gastrointestinal maladies compared to the normal population, in addition to an IBS diagnosis. Patients have increased healthcare visits and costs, raising insurance rates for all, and also results in more missed time from work. There are limited treatments available for IBS-C, and medicinal and non-medicinal modalities are differentially prescribed to patients throughout the country. Recently, serotonin has emerged as a key mediator of normal gut …
A Review: The Association Of Asthma And The Microbiome, Kathleen Olson
A Review: The Association Of Asthma And The Microbiome, Kathleen Olson
Biology and Microbiology Graduate Students Plan B Research Projects
The microbiome gut-lung axis has been associated with asthma. Asthma is a respiratory disease that presents itself in many different ways. The microbiome is the bacteria, fungi, protozoa, and viruses found in a particular environment. The association of the microbiome gutlung axis in an asthmatic individual compared to a healthy individual has shown that different types and/or concentrations of bacterial genera are present in an asthmatic individual compared to a healthy individual. A causal relationship between the microbiome and asthma has not yet been identified. The aim of this review is to present the association of asthma and the microbiome …
Pathogenesis Of Cte: A Review Of Ptau, Lewy Bodies, And Cytokine Involvement In Cte, Karter Keefer
Pathogenesis Of Cte: A Review Of Ptau, Lewy Bodies, And Cytokine Involvement In Cte, Karter Keefer
Biology and Microbiology Graduate Students Plan B Research Projects
Chronic Traumatic Encephalopathy (CTE) is a neuropathological disease that develops years after experiencing repetitive traumatic brain injuries. In recent years, this disease has been gaining recognition from professional, college, and high school teams that participate in contact sports. The purpose of this paper is to review available information about this neurodegenerative disease. Only limited published experiments are available on this disease. Research on CTE has been limited by the fact that patients can only be diagnosed with the disease by a post mortem autopsy. Many experiments were analyzed regarding different CTE pathologies, symptoms, and treatments. Articles used in this paper …
A Bioinfomatic Analysis Of Luminal And Mucosal Ileal Bacteria Colonizing Nursery Pigs Fed Different Protein Sources, Jamie L. Ortman
A Bioinfomatic Analysis Of Luminal And Mucosal Ileal Bacteria Colonizing Nursery Pigs Fed Different Protein Sources, Jamie L. Ortman
Electronic Theses and Dissertations
Weaning is a critical time in a young pig’s life that will greatly impact its adult growth and development. The objective of this research was to evaluate the effects of various protein sources on the bacterial composition within luminal and mucosal populations in simple and complex diets to gain a better understanding of factors influencing gut health. Weaned pigs were fed 1 of 3 simple experimental diets: 1) basic diet containing corn and soybean meal (Negative Control - NEG), 2) basic diet + fishmeal (FM; Positive Control - POS), and 3) basic diet + microbially-enhanced soybean meal (MSBM). Phase I …
Transcranial Magnetic Stimulaton: In-Depth Review Of Methods, Efficacy And Future Applications, Matthew Carpenter
Transcranial Magnetic Stimulaton: In-Depth Review Of Methods, Efficacy And Future Applications, Matthew Carpenter
Biology and Microbiology Graduate Students Plan B Research Projects
Transcranial magnetic stimulation (TMS) has been regarded as a novel technique of neuromodulation with applications that span from the treatment of depression or depression related symptoms to the mapping of cerebral regions. This review takes an in depth look into the different forms of magnetic stimulation including repetitive TMS, theta-burst stimulation, and navigated TMS. The efficacy of these different forms of stimulation is addressed as well as comparisons made to current standards being used. Potential clinically relevant future applications of TMS are also discussed from the treatment of obsessive compulsive disorder to improving motor function after stroke. The purpose of …
Role Of Bovine Ileal Sub-Epithelial Myofibroblasts And Epithelial Cells In Innate Immunity, Tirth Uprety
Role Of Bovine Ileal Sub-Epithelial Myofibroblasts And Epithelial Cells In Innate Immunity, Tirth Uprety
Electronic Theses and Dissertations
Gastro-intestinal (GI) tract harbors largest number of microbiota as well as the largest number of immune cells for a given tissue. The host needs to mount an effective immune response against invading pathogens and tolerance against commensals. Thus, regulatory mechanism and barrier function of the GI tract are of utmost importance for appropriate host microbe interaction and gut homeostasis. Intestinal epithelial cells (IECs) act as the first line of defense against invading pathogens. IECs recognize pathogens and commensals and mount an effective innate immune response. Such recognition of pathogens is mediated through germ line encoded pattern recognition receptors (PRRs). Intestinal …
Tripartite Interactions Of Legumes With Arbuscular Mycorrhizal Fungi And Rhizobial Bacteria: Insight Into Plant Growth, Seed Yield, And Resource Exchange, Arjun Kafle
Electronic Theses and Dissertations
Under natural conditions, legumes, such as alfalfa (Medicago) and soybean (Glycine max) are colonized with arbuscular mycorrhizal (AM) fungi and rhizobial bacteria forming tripartite interactions. Legumes are important crop species due to their high nutritional and economic values. Most of the previous literatures focused on experiments with an individual symbiont: either AM fungi or rhizobial bacteria, but not with both symbionts at the same time, thus our current understanding of resource exchange in tripartite interactions is limited. It has been reported that AM fungi primarily provide phosphate (P), nitrogen (N), and other nutritional and non-nutritional benefits while rhizobial bacteria solely …
The Role Of Genomic Versatility In Multi-Niche Preferences Of Escherichia Coli, Gitanjali Nandakafle
The Role Of Genomic Versatility In Multi-Niche Preferences Of Escherichia Coli, Gitanjali Nandakafle
Electronic Theses and Dissertations
Escherichia coli strains are naturally present as either commensals or pathogens in the gastrointestinal tract of mammals and some other vertebrates. Until recently, it was assumed that E. coli are solely associated with the gut and are unable to survive outside of a host for a long period of time, the basis of its use as an indicator organism. Recent reports suggest that E. coli can become naturalized to several tropical, subtropical or temperate soils and aquatic environments, where they have been isolated repeatedly. Several studies have shown that these strains are capable of surviving and proliferating in the environment …
Universal Swine Influenza Antigen And Vaccine, Zhao Wang
Universal Swine Influenza Antigen And Vaccine, Zhao Wang
Electronic Theses and Dissertations
Swine influenza A viruses pose a serious concern for global health and worldwide swine industry considering their evasion from vaccine-induced immune responses. Formulation of effective influenza vaccines can be complicated by both antigenic shift to a different subtype of hemagglutinin (HAs) and antigenic drift within a particular HA subtype. To address these concerns, we employed a systematic approach to determine the antigenic determinants of swine influenza A viruses by focusing on H1 and H3 subtypes. In parallel, we used a cross-disciplinary approach including structural biology and modeling, virology, and immunology to identify swine influenza A virus-derived HA fusion intermediates broadly …
Surveillance Of South Dakota Mosquito Abundance, Infection Rate, And Insecticide Susceptibility, Geoffrey P. Vincent
Surveillance Of South Dakota Mosquito Abundance, Infection Rate, And Insecticide Susceptibility, Geoffrey P. Vincent
Electronic Theses and Dissertations
The aim of this dissertation was to survey and evaluate the abundance, infection rate, and insecticide susceptibility of mosquito fauna present in South Dakota. Mosquito surveillance has been conducted across South Dakota to record and track potential West Nile virus (WNV) vectors from 2004 to 2017. The nuisance mosquito Aedes vexans was found to be the most abundant species overall in the state and most abundant in many of the regions. The WNV vector, Culex tarsalis, was found to be the second most abundant mosquito and the most abundant vector mosquito across the state. However, geospatial variation did exist between …
Serological Evidence For The Co-Circulation Of Two Lineages Of Influenza D Virus In Equine Populations Of The Midwest United States, Hunter Theodore Nedland
Serological Evidence For The Co-Circulation Of Two Lineages Of Influenza D Virus In Equine Populations Of The Midwest United States, Hunter Theodore Nedland
Electronic Theses and Dissertations
Influenza D virus (IDV) is a newly described lineage of the Orthomyxoviridae virus family that was first isolated from diseased swine in 2011 and has subsequently been detected in cattle around the world in 2014. In addition, serological evidence for IDV infection in humans has been recently established. Despite all the progress, the full range of susceptible hosts for this novel virus has yet to be determined, but includes swine, bovine, small ruminants and human. This study was designed to determine if equine is a possible host to this newly emerging influenza virus. 364 equine serum samples were collected in …
Improving The Nutritional Characteristics Of Plant Feedstuff By-Products Using Fungal Metabolism, Jacob Zahler
Improving The Nutritional Characteristics Of Plant Feedstuff By-Products Using Fungal Metabolism, Jacob Zahler
Electronic Theses and Dissertations
Plant feedstuff by-products such as soy processing wastewater, guar korma meal, and sorghum hominy are very different, however, all possess a rich nutrient profile. Lessening their value is the presence of lignocellulose, plant anti-nutritional factors, and unfavorable protein profiles. Fungal conversion processes are an attractive approach to improving the value of these by-products by degrading detrimental fractions of each while simultaneously creating nutrient-rich cell mass. The aim of this research was to improve the value of each by-product for potential application in monogastric diets such as fish. Fungal organisms, both yeast and filamentous fungi, were examined for their ability to …
Dissecting Rna Silencing Pathways In Sclerotinia Sclerotiorum, Pauline Mochama
Dissecting Rna Silencing Pathways In Sclerotinia Sclerotiorum, Pauline Mochama
Electronic Theses and Dissertations
RNA silencing, also known as RNA interference, is an essential mechanism in plants, animals and fungi that functions in gene regulation and defense against foreign nucleic acids. In fungi, RNA silencing has been shown to function primarily in defense against invasive nucleic acids. RNA-silencing- deficient fungi show increased susceptibility to virus infection. Plant pathogenic fungi also utilize RNA silencing to silence plant host immunity genes through the delivery of fungal small RNAs into plants. This cross-kingdom RNA silencing facilitates fungal infection of plants. Overall, these findings demonstrate the significant contributions of fungal RNA silencing pathways to fungal virulence and viral …
Replication, Virulence, And Pathogenesis Of Influenza Viruses, Chithra Chembil Sreenivasan
Replication, Virulence, And Pathogenesis Of Influenza Viruses, Chithra Chembil Sreenivasan
Electronic Theses and Dissertations
Influenza D virus (IDV) is a novel influenza virus that infects cattle and swine, with cattle as its primary host species. The goal of our first study was to investigate the replication and transmission of bovine IDV in guinea pigs. Following direct intranasal inoculation of animals, the virus was detected in nasal washes of infected animals during the first 7 days post-infection. High viral titers were obtained from nasal turbinates and lung tissues of directly inoculated animals. Further, bovine IDV was able to transmit from the infected guinea pigs to sentinel animals by means of contact and not by aerosol …
Immunization By Radiotherapy: Enhancing An Immune-Mediated Abscopal Effect, Amy Steffen
Immunization By Radiotherapy: Enhancing An Immune-Mediated Abscopal Effect, Amy Steffen
Biology and Microbiology Graduate Students Plan B Research Projects
Radiotherapy aims to destroy tumors by inducing DNA damage in their cells at the local irradiation site. Its immune-mediated systemic effects, called abscopal effect, has shown to enhance anti-tumor immunity when combined with immune therapies and thus, have gained attention by researchers and clinicians to investigate. Below is a summary of the fundamentals of cancer and the immune system’s response to it, as well as the changes in the phenotype and microenvironment of tumor cells after exposure to radiation. Impacts of the abscopal effect and the induction of effective antitumor immunity with various immune therapy strategies will be outlined. The …
Increasing The Clinical Efficacy Of Radiotherapeutics For Solid Tumors By Inhibition Of Hypoxia Inducible Factor-1a, Austin Levi Walz
Increasing The Clinical Efficacy Of Radiotherapeutics For Solid Tumors By Inhibition Of Hypoxia Inducible Factor-1a, Austin Levi Walz
Biology and Microbiology Graduate Students Plan B Research Projects
Radiotherapy is commonly used in a variety of tumor types and is effective in control of long term progression and may be curative under certain circumstances. Radiotherapeutics have been shown to be the single most effective therapeutic for cancer and only account for 5% of the total cost. However, treatment of cells with radiation causes the tumor microenvironment to undergo changes and leads to cycles of hypoxia inside the tumor which allows for the cell to undergo angiogenesis, metastasize and may lead to repopulation of the tumor. Current systemic chemotherapeutics typically have an additive toxicity due to the unintended targeting …
A Review Of Multiple Sclerosis Treatments: Interferon Beta, Glatiramer Acetate, Fingolimod, And Natalizumab, Ryan Golden
A Review Of Multiple Sclerosis Treatments: Interferon Beta, Glatiramer Acetate, Fingolimod, And Natalizumab, Ryan Golden
Biology and Microbiology Graduate Students Plan B Research Projects
Multiple Sclerosis (MS) is an autoimmune disease in which the body’s own immune system works to demyelinate the myelin sheaths in the central nervous system. The beginning of the review will concentrate on the history of MS while also describing how MS, the disease, differs from that of normal immune responses. The review then shifts to the four different stages of MS and how to differentiate between the stages, since the treatment options are often dependent on the stage of MS that the patient is in. The main focus of this review is to take an in depth look on …